Sigmund bergmans



(No Model.)

s. BERGMANNQ INGANDESOENT'LAMP SOCKET.

No. 443,562. Patented Dec. 30, 1890.

Fig. 2.

INVENTOR Z0636 (777M701,

Sign

BY 2 i H/J ATTORNEYS WITN SSESI' UNITED STATES PATENT OFFICE.

SIGMUND BERGMANN, OF NEXV YORK, N. Y.

INCANDESCENT-LAMP SOCKET.

SPECIFICATION forming part of Letters Patent No. 443,562, dated December30, 1890.

Application filed January 10,1890. Serial No. 336,523. (No model) To allwhom it may concern.-

Be it known that I, SIGMUND BERGMANN, a citizen of the United States,residing at New York, county and State of New York, have invented acertain new and useful Improvement in Sockets for Incandescent ElectricLamps, of which the following is a'specification.

The invention consists in the construction and novel arrangementofparts, as hereinafter set forth; and the object is to provide a socketof simple construction and wherein the circuit-wires will not be twistedor abraded by the outer shell.

111 the accompanying drawings, Figure 1 is a vertical section of thesocket as applied to a lamp-chamber. Fig. 2isa front View of the socketwith a portion broken away and the outer shell removed. Fig. 3 is a planof the interior of the socket, and Fig. 4 is a front View, partly insection, with the outer shell removed. Fig. 5 is a perspective view of aportion of the cut-out.

Similar letters of reference designate corresponding parts in all thefigures.

Referring by letter to the drawings, A designates an incandescent-lampchamber having the ordinary metallic tip-piece a in connection with thefilament.

B designates the metal socket, consisting of the inner shell (1, theouter shell or, and the top or cap a The cap a has a central openingthrough it, threaded to engage a bracket, and through which thecircuit-wires pass. The inner surface of the cap a is provided with adisk I) of insulating material, such as rubber or analogous material,and the outer shell a has a bushing b of insulating material, such asrubber or analogous material, rigidly fastened within it, so that therecan be no electrical contact between the cap and outer shell and theinner shell. The inner shell a is threaded to engage the tip of thelamp-chamber. The upper end of the inner shell is turned inwardly toform a flange, and a block b of insulating material, such as rubber oranalogous material, is fitted within the upper end of the shell againstthe flange, so that when the block b is secured to the disk I) by meansof screws the flange will be clamped firmly between the block and disk,

thus holding the shellin place. The block b has a perforation for thepassage of circuitwires in line with the perforation through thecap-piece, and has opposite side notches for the accommodation of thebinding-screws c c. Opposite the notches in the block b the shell (t haswide openings, so that the proper connections may be easily made withthe binding-screws c 0 when the outer shell is re moved. An integraltongue 0 extends from the shell a below and independent of the flangeand connects with the binding-screw 0, thus making the shell a one poleor contact, and a contact-piece c engages with the binding-screw c. Thiscontact-piece c is preferably of resilient metal and has one end bentinwardly below the block 17 contacting with the tip a of the lamp. Byproviding the integral tongue 0 in contact with a bindingscrew Isimplify the construction by doing away with the extra thick piece ofmetal or dinarily used for that purpose. The outer shell 0. is securedin place by means of screws d passing through it into the block 12 theopening through the shell afor the passage of the screws being enlarged,so that the screws will not contact with the shell.

By securing the outer shell as described there is no danger of itscoming loose, as is liable when the shell is secured by means of ahard-rubber ring engaging with the thread of the inner shell. Suchrubber rings are also objectionable, inasmuch as such rings aresometimes burned or scorched, giving forth a bad odor.

The socket described herein may be made very much smaller in its outwarddimensions than those heretofore made for the same size of lamp.

Having described my invention, what I claim is 1. In a socket forincandescent lamps, the combination of an outer shell, a bushing ofinsulating material rigidly secured in the shell, a cap having a centralthreaded opening, a disk of insulating material on the inner face of thecap, the inner shell having an inwardly-turned flange, ablock ofinsulating material within the shell fitted against the flange, means,substantially such as described, for securing the block, binding-screwson the insnlatingbloclc, a tongue integral with the inner shell,independent of the flange, and extended to abinding-screw on the block,and a resilient contact-piece engaging with another an integral tongueextending from the inner 5 binding-screw on the block, substantially as'shell,independent of the flange, to abindingl turned flange and thewide side openings, at

specified; screw, and a resilient contact-piece extending block ofinsulating material having opposite notches, binding-screws Within saidnotches, I5

2. In a socket, the combination of an enter from the otherbinding-screw, substantially shell, a bushing of insulating materialrigidly as specified.

secured in the shell and extending its entire [0 length, a cap having acentral opening, a disk of insulating material on the inner face of thecap, the inner shell having the inwardly- IGMUND BERGMAYN.

Witnesses:

IIULBERT PECK, l. U. KLEIN, Jr.

